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如果想要對(duì)考試成績(jī)進(jìn)行分級(jí):優(yōu)秀:>90;良好:>80,合格:>60,不及格:<60,則以下公式正確的是()。

A.=IF(A1<60,"不及格",if(A1<80,"合格",if(A1<=90,"良好","優(yōu)秀")))
B.=IF(A1<60,"不及格",if(A1<=80,"合格",if(A1<90,"良好","優(yōu)秀")))
C.=IF(A1>90,"優(yōu)秀",if(A1<60,"不及格",if(A1>80,"良好","合格")))
D.=IF(A1>90,"優(yōu)秀",if(A1<60,"不及格",if(A1=>80,"良好","合格")))

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